Definition:
The phrase "cock-and-bull story" refers to a tale or explanation that is interesting but not believable or true. People often use this expression when they think someone is making up a story, especially as an excuse for something.
While "cock-and-bull story" itself is an idiom, you might also consider these related expressions: - "To spin a yarn": This means to tell a story, often a long or exaggerated one. - "To pull someone's leg": This means to joke with someone or to trick them in a playful way.
A "cock-and-bull story" is an entertaining but unlikely story often told as an excuse. It is useful in informal settings when discussing someone’s unconvincing tale.